Malicious PDF — malware analysis report

Static analysis result for SHA-256 e139ddd544053eba…

MALICIOUS

PDF

40.0 KB Created: 2020-11-03 06:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8c3084c39b715a2ede5eef362df55389 SHA-1: 15bde76c2f8f41d4aca2bf8319a0879cb3f2ff54 SHA-256: e139ddd544053eba00e2f4c8af6426a4663cc105f32c7414b0f8e9a3c15b4486
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at 'https://ggtraff.ru/aws?keyword=fundamentals+of+abnormal+psychology+comer+pdf'. The presence of many external PDF links suggests a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/aws?keyword=fundamentals+of+abnormal+psychology+comer+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5f8fd7f679ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f9516fedb2cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/3914/3062/files/bpmc_act_in_gujarati.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/industrial_society_and_its_future.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5799/8743/files/jomekavilirefegepijatureb.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/2281341247.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/psychology_class_11_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/6962/9350/files/non_st_elevation_acs_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5787/6644/files/sniper_oyunlar_apk_day.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6202/4123/files/37530996340.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3192/8730/files/dynamics_ax_2020_r3_retail_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/duraterediw.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/pojolifevisawazep.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D33 5764 bytes
SHA-256: 349e32541e5dfc6ed5d243a5145241f8bd8c8b97f22e9201768fdba7afc0a5cb
font_01_sfnt_off000070b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B6 10052 bytes
SHA-256: a1aff2254b3eae4058e32213457aadbb86a9acf76bc5745998555e5377693836

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